JP2000203410A - Parking brake device - Google Patents

Abstract

(57) [Problem] To provide a parking brake device capable of reducing the operating force of a parking brake. SOLUTION: A hydraulic brake for controlling a brake by controlling a hydraulic pressure in a wheel cylinder by a hydraulic pressure generated by a pump and a parking brake for performing a brake control by an operating force of a parking brake lever 60 are integrally formed. In the parking brake device, a parking brake S / W 62 for detecting the operation of the parking brake lever and a hydraulic pressure transmission for transmitting the hydraulic pressure generated by the pump into the wheel cylinder when the operation of the parking brake lever is detected. Means 16, 18, 28
And a stroke sensor 64 for detecting the operation amount of the parking brake lever. When it is detected that the parking brake lever has been operated by a predetermined amount, the transmission of the hydraulic pressure by the hydraulic pressure transmission means is terminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic brake for controlling brakes by controlling a hydraulic pressure in a wheel cylinder and a parking brake for performing brake control by operating force of a parking brake operation instructing means. Parking brake device.

[0002]

2. Description of the Related Art In a parking brake device, a hydraulic brake for controlling a brake by controlling a hydraulic pressure in a wheel cylinder and a parking brake for performing a brake control by an operating force of a parking brake lever are integrally formed. There is a parking brake device. In such a parking brake device, the parking brake is formed integrally with the disc brake, and when the parking brake is operated, the piston is pressed toward the brake pad by the operating force of the parking brake lever to generate a stopping force.

However, in order to operate the parking brake, a brake lever or the like must be operated against the reaction force of the return spring, and a large operating force is required. Therefore, there is a parking brake device that operates a parking mechanism by hydraulic pressure (Japanese Patent Application Laid-Open No. 60-1985).
No. 213544).

[0004] It is an object of the present invention to provide a parking brake device capable of reducing the operation force of a parking brake.

[0005]

According to a first aspect of the present invention, there is provided a parking brake device which controls a hydraulic pressure in a wheel cylinder by a hydraulic pressure to perform a brake control, and a brake by an operating force of a parking brake operation instruction means. In a parking brake device in which a parking brake for performing control is integrally formed, a detecting means for detecting the operation of the parking brake operation instruction means, and when the operation of the parking brake operation instruction means is detected by the detection means, And a hydraulic pressure transmitting means for transmitting the hydraulic pressure generated by the pump into the wheel cylinder.

According to the parking brake device of the present invention, when the operation of the parking brake operation instructing means is detected by the detecting means, for example, the parking brake lever, the hydraulic pressure generated by the pump by the hydraulic pressure transmitting means is increased. It is transmitted into the wheel cylinder. Accordingly, since the return spring in the wheel cylinder is compressed by the hydraulic pressure, the reaction force of the return spring transmitted to the parking brake operation instruction means is reduced, so that the parking brake operation instruction means can be operated with a small force. it can.

According to a second aspect of the present invention, the parking brake device further comprises an operation amount detecting means for detecting an operation amount of the parking brake operation instruction means in addition to the parking brake device according to the first aspect. The transmission of the hydraulic pressure by the hydraulic pressure transmission means is terminated when it is detected that the parking brake activation instruction means has been operated by a predetermined amount.

According to the second aspect of the present invention, the hydraulic pressure is transmitted by the hydraulic pressure transmitting means until the operation amount detecting means, for example, the stroke sensor detects that the parking brake operation instructing means has operated by the predetermined amount. Since the transmission is performed, the parking brake operation instructing means can be operated with a small force until the predetermined amount necessary to generate a sufficient stopping force is operated.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a hydraulic circuit diagram of a vehicle behavior control (VSC) system by brake control according to the embodiment.

The hydraulic circuit of this VSC system has a master cylinder 12 for pumping hydraulic oil in response to a driver's depressing operation of a brake pedal 10. The master cylinder 12 includes a master cut valve 14a, a rear circuit solenoid valve 16a, and a holding solenoid valve 18FL.
Is connected to the wheel cylinder 20FL of the left front wheel via the master cut valve 14a and the holding solenoid valve 18RR.

An accumulator 26a for storing a hydraulic pressure (hydraulic pressure) boosted by a pump 24a driven by the motor 22 is connected to a wheel cylinder 20FL of the left front wheel via a holding solenoid valve 18FL. It is connected to the wheel cylinder 20RR of the right rear wheel via the right. The wheel cylinder 20FL of the left front wheel is connected to the reservoir 30a via a pressure reducing solenoid valve 28FL, and is connected to the reservoir 30a via a pressure reducing solenoid valve 28RR. Further, the reservoir 30a is connected to the master cylinder 12 via a reservoir cut solenoid valve 32a.

Similarly, the master cylinder 12 is connected to the right front wheel cylinder 20FR via a master cut valve 14b, a rear circuit solenoid valve 16b, and a holding solenoid valve valve 18FR. It is connected to a wheel cylinder 20RL of the left rear wheel via 18RL.

An accumulator 2 for storing a hydraulic pressure boosted by a pump 24b driven by a motor 22.
6b is connected to the right front wheel cylinder 20FR via the holding solenoid valve 18FR, and is connected to the left rear wheel cylinder 20RL via the holding solenoid valve 18RL.
It is connected to the. The right front wheel cylinder 2
0FR is connected to the reservoir 30b via a pressure reducing solenoid valve 28FR, and is connected to the reservoir 30b via a pressure reducing solenoid valve 28RL. Further, the reservoir 30b is connected to the master cylinder 12 via a reservoir cut solenoid valve 32b.

Here, the wheel cylinder 20RR for the right rear wheel and the wheel cylinder 20RL for the left rear wheel are provided in a caliper body of a disc brake device integrally formed with a parking brake device. The left front wheel cylinder 20FL and the right front wheel cylinder 20FL
FR is provided in the caliper body of a normal disc brake device.

FIG. 2 is a sectional view of a disc brake device in which a parking brake device is integrally formed. Wheel cylinder 20 provided on caliper body 40
A cylindrical spindle 42 is provided in the RR and 20RL, and one end of the spindle 42 is
4 is inserted. A return spring 45 is arranged on the outer periphery of the sleeve 44.

One end of the sleeve 44 is
6 are arranged so as to be in contact with the inner bottom. One end of a connecting link 48 is in contact with the other end of the spindle 42, and the other end of the connecting link 48 is in contact with the bottom surface of a U-shaped recess provided on the spindle lever 50. The spindle lever 50 rotates around the axis by pulling up the parking brake lever, and moves the connecting link 48 toward the spindle 42.

FIG. 3 is a diagram showing a control block of the parking brake device. The parking brake lever 60 is provided with a parking brake S / W 62 and a stroke sensor 64.
/ W62 and a detection signal detected by the stroke sensor 64 are input to the VSC-ECU 68. On the other hand, VS
From the C-ECU 68, the motor 22, the rear circuit solenoid valves 16a, 16b, and the holding solenoid valves 18FL, 1
8FR, 18RL, 18RR, pressure reducing solenoid valve 28FL,
Control signals are output to 28FR, 28RL, and 28RR.

In order to generate a stopping force by the parking brake device, the parking brake lever 60 is pulled up so that the spindle 42 and the sleeve 44
As a result, the piston 46 is moved in the direction of the brake pad 52, and the brake pad 52 is pressed against the brake disc 54 to generate a stopping force.

In this case, the parking brake lever 6
When 0 is operated, the parking brake S / W 62 is turned on, and an ON signal is input to the VSC-ECU 68.
In response to the input of the ON signal, the VSC-ECU 68
The pumps 24a and 24b are operated and a control signal is output to the rear circuit solenoid valves 16a and 16b to open the rear circuit solenoid valves 16a and 16b.

As a result, the right rear wheel cylinder 20
The hydraulic pressure is transmitted to the RR and the wheel cylinder 20RL of the left rear wheel, and the spindle 42 and the sleeve 44
In the direction to compress the return spring 45.
Accordingly, since the reaction force of the return spring 45 transmitted to the parking brake lever 60 is reduced, the parking brake lever 60 can be pulled up with a small force.

When it is detected that the parking brake lever 60 has been pulled up by a predetermined amount by the stroke sensor 64 which detects the amount of pulling up of the parking brake lever 60, the pumps 24a and 24b are stopped, and the pressure reducing solenoid valves 28RL and 28RR are turned off. The parking brake lever 60 is opened with a small force until the parking brake lever 60 is pulled up by a predetermined amount necessary to generate a sufficient stopping force in order to open the wheel cylinders 20RL and 20RR to reduce the pressure in the wheel cylinders 20RL and 20RR and terminate the operation of the parking brake device. Can be raised.

In the above-described embodiment, when a pressure-sensitive switch is provided in the driver's seat, and a driver is present in the driver's seat, the power supply system of the VSC system is set to a standby state and the parking brake device is activated after the operation. By turning off the power supply system of the VSC system, the parking brake device can be reliably operated even when the ignition switch is turned off as it is after stopping with the foot brake.

In the above embodiment, VS
Although the case where hydraulic pressure is generated in the rear wheel cylinders 20RL and 20RR by the pumps 24a and 24b of the C system has been described, hydraulic pressure may be generated in the rear brake by the pump of the electronic control brake system.

[0024]

According to the first aspect of the present invention, since the return spring in the wheel cylinder is compressed by the hydraulic pressure, the reaction force of the return spring transmitted to the parking brake operation instruction means is reduced. The parking brake operation instruction means can be operated with a small force.

According to the second aspect of the present invention, the transmission of the hydraulic pressure by the hydraulic pressure transmission means is performed until the operation amount detection means detects that the parking brake operation instruction means has operated by the predetermined amount. The parking brake operation instructing means can be operated with a small force until the predetermined amount required for generating a sufficient stopping force is operated.

[Brief description of the drawings]

FIG. 1 is a brake hydraulic circuit diagram of a vehicle behavior control (VSC) system by brake control according to an embodiment.

FIG. 2 is a sectional view of a disc brake device in which the parking brake device according to the embodiment is integrally formed.

FIG. 3 is a diagram showing a VSC-ECU and the like for operating the parking brake device according to the embodiment;

[Explanation of symbols]

10: brake pedal, 12: master cylinder, 14
a, 14b: master cut valve, 16a, 16b: rear circuit solenoid valve, 18FL to 18RR: holding solenoid valve, 20FL to 20RR: wheel cylinder, 22
... Motors, 24a, 24b ... Pumps, 26a, 26b ...
Accumulators, 28FL-28RR: pressure reducing solenoid valves, 30a, 30b: reservoir, 60: parking brake lever, 62: parking brake S / W, 64 ...
Stroke sensor, 68 ... VSC-ECU.

Claims (2)

[Claims] 1. A parking system in which a hydraulic brake for controlling a brake by controlling a hydraulic pressure in a wheel cylinder by a hydraulic pressure and a parking brake for performing a brake control by an operating force of a parking brake operation instructing means are integrally formed. In the brake device, detecting means for detecting the operation of the parking brake operation instruction means, and transmitting the hydraulic pressure generated by the pump to the wheel cylinder when the operation of the parking brake operation instruction means is detected by the detection means. And a hydraulic pressure transmitting means. 2. The vehicle according to claim 1, further comprising an operation amount detection unit detecting an operation amount of the parking brake operation instruction unit, wherein the operation amount detection unit detects that the parking brake operation instruction unit is operated by a predetermined amount. The parking brake device according to claim 1, wherein the transmission of the hydraulic pressure by the hydraulic pressure transmitting means is terminated.